Hello,
On 2011.11.11 17:38, Sorin Dudui wrote:
Hi,
I have the following function:
===============================
CREATE OR REPLACE FUNCTION xxx(text)
RETURNS SETOF vvvvv AS
$BODY$
select a.x, a.y,
CASE
WHEN strpos($1,b.x) > 0
THEN b.x
ELSE NULL
END AS mp_hm
from a LEFT JOIN b ON a.id=b.id
$BODY$
LANGUAGE sql STABLE
COST 1000
ROWS 10000;
===============================
which I call as:
select * from xxx(‘test0|test1‘) where a.x = ‘value’
You should get an error as there is no "a" in this statement...
I am wondering when the where clause (a.x = ‘value’) is executed. After the select statement in the function finishes? Or is it appended at the select statement in the function?
Function execute plan is prepared when creating it, so the "where" clause should check the function result not altering its execution..
--
Julius Tuskenis
Head of the programming department
UAB nSoft
mob. +37068233050
